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PTCHThe PTCH parachute was a flat circular canopy manufactured by Omnipol. Over several design modifications it had drive and turn slots. The performance was good enough to make it a competative canopy at World Meets from 1956 to 1968.
The PTCH-7, shown below, had several turn slots on each side of the canopy. Stabilizers on each side improved stability.
At the 1958 World Meet in Czechoslovakia the Czechs used the PTCH-1.
By the 1966 World Meet in Leipzip, Germany the PTCH-6 was a capable contender.
Here are planform views of the PTCH to PTCH-7.
The rubber connecting webbing at the apex of the canopy was to be packed as shown in these diagrams.
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